Cosan S.A 6-K, filed Oct 21, 2026
Cosan S.A. (CSANY)
About this 6-K
Cosan S.A filed this 6-K on October 21, 2026.
Cosan S.A. ended exclusive negotiations over the potential sale of its equity interest in Rumo S.A. without reaching an agreement it considered strategically and commercially appropriate; it continues evaluating alternatives across its assets to optimize its capital structure. AI summary
UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
Report of Foreign Issuer
Pursuant To Rule 13a-16 Or 15d-16 of the
Securities Exchange Act of 1934
For the month of October 2026
Commission File Number: 333-251238
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COSAN S.A.
(Exact name of registrant as specified in its charter)
N/A
(Translation of registrant’s name into English)
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Av. Brigadeiro Faria Lima, 4100, – 16th floor
São Paulo, SP 04538-132 Brazil
(Address of principal executive offices)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40‑F:
Form 20-F ☒ Form 40-F ☐
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):
Yes ☐ No ☒
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):
Yes ☐ No ☒
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COSAN S.A.
CNPJ nº 50.746.577/0001-15
NIRE 35.300.177.045
Publicly Held Company
CVM Code 01983-6
MATERIAL FACT
COSAN S.A. (B3: CSAN3; OTC Pink: CSANY) (the “Company” or “Cosan”), in compliance with Brazilian Securities and Exchange Commission (“CVM”) Resolution No. 44/2021 and further to the Notice to the Market disclosed on June 29, 2026, and the Material Fact disclosed on August 20, 2026, hereby informs its shareholders and the market in general that, in connection with the proposals received for a potential sale of its equity interest in Rumo S.A. (“Rumo”), the Company engaged in exclusive negotiations with potential investors interested in such equity interest. However, as of this date, the exclusivity period has expired without the Company reaching any agreement that it deemed strategically and commercially appropriate for the sale of any portion of its equity interest.
Cosan reiterates that it continues to evaluate alternatives across all of its assets with a view to optimizing its capital structure, while remaining committed to creating value for its shareholders in connection with any such potential transactions.
The Company will keep its shareholders and the market informed in accordance with applicable regulations.
São Paulo, October 20, 2026.
José Cezario Menezes de Barros Sobrinho
Chief Financial and Investor Relations Officer
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
Date: October 20, 2026
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COSAN S.A. |
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By: |
/s/ José Cezario Menezes de Barros Sobrinho |
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Name: José Cezario Menezes de Barros Sobrinho |
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Title: Chief Financial Officer |
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